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Posted: 8/26/2013 8:21:48 PM EDT
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I've had this problem a few times at the range now and am trying to see if anyone has had a similar experience. Magazine used is a Magpul Gen2 and Gen3 magazine. Ammo was Winchester White Box and PMC. The weapon system was cleaned before shooting. Some of my friends and I think that my bolt was moving too fast and a heavier buffer may do the trick. Any other suggestions out there?
http://i1071.photobucket.com/albums/u505/charbonneau482/IMG_20130816_125501_205_zps9f7c4d24.jpg |
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I would try the easier stuff 1st...swap buffer.
check gas key for tightness key dragging on gas tube? Plenty of lube? good mag springs? good buffer spring? known good ammo? and then we can check gas block alignment with port. How many rds on rifle and what length gas? |
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Quoted:
I would try the easier stuff 1st...swap buffer. check gas key for tightness key dragging on gas tube? Plenty of lube? good mag springs? good buffer spring? known good ammo? and then we can check gas block alignment with port. How many rds on rifle and what length gas? The EASIEST thing to do first is to LUBE YOUR RIFLE!!!!! |
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Quoted:
The EASIEST thing to do first is to LUBE YOUR RIFLE!!!!! Quoted:
Quoted:
I would try the easier stuff 1st...swap buffer. check gas key for tightness key dragging on gas tube? Plenty of lube? good mag springs? good buffer spring? known good ammo? and then we can check gas block alignment with port. How many rds on rifle and what length gas? The EASIEST thing to do first is to LUBE YOUR RIFLE!!!!! Agreed go to Walmart and buy a quart of Mobil 1 Synth oil and put some lubrication on the bolt and carrier rails. |
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More details please.
Does it lock to the rear on the last shot? How many magazines do this or is it just one? What brand of mags do this? Does the fired shell extract right before this happens? How often does this happen? Where and what direction does the brass eject to? Have you put that upper on someone else's lower to see what happens? Is the rifle properly lubed up? What gas system are you using? Is it a stock Daniels or is it a Frankenbuild? What buffer are you running? |
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I'm with everyone else who says more info needed.
Barrel length? Gas system length? Like others have said, load one round, chamber it, shoot. If bolt locks back you have enough gas and there's a chance your rifle is over-gassed thus meaning a heavier buffer is necessary. If the bolt does not lock back first thing I'd do is lube (as many others have said). Then I'd look to make sure that the gas block hasn't canted or moved forward. If all of that checked out I'd look at the gas key and finally the gas port size. |
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I apologize for the lack of info. Here is an updated thread.
Does it lock to the rear on the last shot? Yes, the bolt consistently locks back whether I fired a full mag or just one round. How many magazines do this or is it just one? I have a few mags that have had this happen. What brand of mags do this? I'm using Gen2 and Gen3 Pmags which are all new. Does the fired shell extract right before this happens? Yes, the shell extracts and ejects at a 4-5 o'clock direction. How often does this happen? I have this happen about every 150-200 rounds. Where and what direction does the brass eject to? 4-5 o'clock direction. Have you put that upper on someone else's lower to see what happens? I have not tried this upper on another lower. Is the rifle properly lubed up? I lubed the rifle before I went to the range. I put a light film of lube on the carrier and a good amount of lube on the bolt. What gas system are you using? Mid length Is it a stock Daniels or is it a Frankenbuild? Complete DD upper from factory but a custom lower. What buffer are you running? Carbine buffer |
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Quoted:
I apologize for the lack of info. Here is an updated thread. Does it lock to the rear on the last shot? Yes, the bolt consistently locks back whether I fired a full mag or just one round. How many magazines do this or is it just one? I have a few mags that have had this happen. What brand of mags do this? I'm using Gen2 and Gen3 Pmags which are all new. Does the fired shell extract right before this happens? Yes, the shell extracts and ejects at a 4-5 o'clock direction. How often does this happen? I have this happen about every 150-200 rounds. Where and what direction does the brass eject to? 4-5 o'clock direction. Have you put that upper on someone else's lower to see what happens? I have not tried this upper on another lower. Is the rifle properly lubed up? I lubed the rifle before I went to the range. I put a light film of lube on the carrier and a good amount of lube on the bolt. What gas system are you using? Mid length Is it a stock Daniels or is it a Frankenbuild? Complete DD upper from factory but a custom lower. What buffer are you running? Carbine buffer What kind of Lube? RemOil? |
| Not to be the smart ass I'm usually am. But when we are asking what kind of buffer and spring you are using? We are asking is it a normal weight buffer or h, h2, etc. and as for spring is it an enhanced or a better over stock. But any way could be feed ramps on mag out of wack. |
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Quoted:
I'll see if I can borrow by buddies lower for a few hours and toss a couple hundred rounds down range. As far as I can tell, the mag lips are not distorted or bent. The Pmags are pretty new. Your problem does not seem to occur that frequently. I am still leaning towards a certain magazine. Even new magazines can have a shitty spring every once in a while, or the mag may simply be out of spec internally. Heck, it may not even be the mag, it could be the follower. Every time it happens, set that particular magazine aside. I bet you isolate a magazine or two. |
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Quoted: Your problem does not seem to occur that frequently. I am still leaning towards a certain magazine. Even new magazines can have a shitty spring every once in a while, or the mag may simply be out of spec internally. Heck, it may not even be the mag, it could be the follower. Every time it happens, set that particular magazine aside. I bet you isolate a magazine or two. Quoted: Quoted: I'll see if I can borrow by buddies lower for a few hours and toss a couple hundred rounds down range. As far as I can tell, the mag lips are not distorted or bent. The Pmags are pretty new. Your problem does not seem to occur that frequently. I am still leaning towards a certain magazine. Even new magazines can have a shitty spring every once in a while, or the mag may simply be out of spec internally. Heck, it may not even be the mag, it could be the follower. Every time it happens, set that particular magazine aside. I bet you isolate a magazine or two. |
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Quoted:
I've had this problem a few times at the range now and am trying to see if anyone has had a similar experience. Magazine used is a Magpul Gen2 and Gen3 magazine. Ammo was Winchester White Box and PMC. The weapon system was cleaned before shooting. Some of my friends and I think that my bolt was moving too fast and a heavier buffer may do the trick. Any other suggestions out there? <a href="http://s1071.photobucket.com/user/charbonneau482/media/IMG_20130816_125501_205_zps9f7c4d24.jpg.html" target="_blank">http://i1071.photobucket.com/albums/u505/charbonneau482/IMG_20130816_125501_205_zps9f7c4d24.jpg</a> My RRA Middy with about 1800 rounds fired through it still does this with a Magpul 20 rounder with that centerlip/ divider on the magazine, any other magazine.. no feeding issues what so ever. The little arrow like thing in this pic at the nose of the rounds. |
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